High Density Liquid Crystalline DNA

Ribbon and brush-shaped fans in this specimen are highly striated. This is another example of a liquid crystalline DNA sample that is approaching the concentration observed in single crystals. The DNA concentration for this specimen is approximately 500 milligrams per millimeter, and the magnification is approximately 350x. The digital image presented above was originally recorded on Fujichrome 64T transparency film using a Nikon Optiphot-Pol microscope with crossed polarized illumination. Exposures were recorded about 2.5 f-steps under the recommended value given by an in-camera photomultiplier and were push-processed approximately 1.5 f-steps in the first E-6 developer.